echarts图例如何添加百分比

const pieChart = async () => {const myChart = echarts.init(piepic.value)const piedata = await getPieData(); // 等待数据返回myChart.setOption({title: {},grid: {},tooltip: {trigger: 'item',},legend: {top: 'middle',align:'left',icon: 'circle',textStyle: {fontSize: 12,padding: [0, 10, 0, -5] //图例文字内间距},orient: 'vertical',right:10,backgroundColor:'#f7f7f7',formatter: function (name) {var total = 0;var tarValue;for (var i = 0; i < piedata.length; i++) {total += piedata[i].value;if (name === piedata[i].name) {tarValue = piedata[i].value;}}var p = Math.round((tarValue / total) * 100);return name + p + "%";},},series: [{type: 'pie',radius: ['40%', '60%'],center: ['30%', '50%'],padAngle: 2,label: {show: false,position: 'center'},labelLine: {show: false},data:piedata,}]})
}